Backyard Aquaponics
A place to discuss aquaponics

Can i use the organic pesticide Bt (Bacillus thuringiensis) on my veges? will it harm my fish?

You can use it. I have used the product Thuricide on plants in my system and many people use Dipel dust. Both those products are Bt (Bacillus thuringiensis) products.

Only warning would be to avoid using soaps or detergents as spreader stickers with those products since those would be bad for the fish.

For the plant's sake, don't spray when it is really really hot, wait till evening if you must spray during hot weather since just about anything will burn plants if you spray early in the day on a hot day.

Doesn't look like a problem, I found this on the web:

Toxicity to Aquatic Animals

Freshwater fish: trout and bluegill (154-19)

Cited studies indicate no toxicity or pathogenicity associated with Bt israelensis.

Freshwater invertebrates: Daphnia (154-20)

Cited study indicates that Bt israelensis is moderately toxic to Daphnia. The use rates of all end use products formulated from Bt israelensis strain EG2215 will be evaluated prior to registration to determine the risk to non-target aquatic invertebrates.

Estuarine and marine animals: grass shrimp, sheepshead minnow, copepod (154-21)

Cited studies indicate no toxicity or pathogenicity in these species associated with Bt israelensis.

thanks, thats great help1

Yep... it commonly called "dipel"... at least the Yates product is... and it's one of the few approved AP treatments

Just need an AP safe wetting agent now.

thanks, yes i have dipel

I use a small amount of dishwashing liquid in my dipel mix to make it stick. I put a bit of cooking oil in it to help combat aphids too.

Just dont go pouring it straight into the fish tank